Revealing mistake: When Del is trying to sell those hooky toy dogs, there are some shots of the policeman walking across the street. The same clip of that policeman is played twice, only one is longer than the other (note a grey-haired man walk across the screen twice). (00:01:35)
Revealing mistake: In the Trotter's flat at the start, in some shots, you can see the mirror has been bent so you can't see the camera's reflection.
Revealing mistake: When the kid steals the orange, look how the orange is conveniently placed higher than the rest to make it easier for him to pick up.
Revealing mistake: When Denzil's wife storms out of the room and slams the door behind her, you can see that the wall to the right of the door lurches forward under the pressure of the closing door.
Revealing mistake: In the opening scene, there is no light switch in the Trotter's flat.
Revealing mistake: When Del is grabbing the snooker cue off the crazy man, you can see Del stick his thumb up for the other actor to hold during the snooker cue joke. (00:28:35)
Chosen answer: An apparent long string of illnesses.